* MacOS: Don't crash when loading files with
  certain non-ascii characters (e.g. Japanese) in
  their filename. (Possibly only a problem in very
  recent versions of MacOS.)
* Demo songs: New song called "Night comes" by Nay.
* MacOS: Workaround for strange trackpad behavior
  causing two-finger-touching a seqblock not always
  working.
* Instrument: Remove the "locked instrument" concept.
  (Yustin / Kmatheussen)
* Instrument: Never automatically change instrument
  when playing song when the cursor is moved to a new
  editor track. (Yustin / Kmatheussen)
* Instrument: Replace the "locked" checkbox with
  a "select" button.
* GUI: Remember window positions and so forth between
  sessions. (Akimaze)
* Instruments Clarify what the "set new name" option
  does.
* Sequencer: Enable "Delete all selected" also when
  only one seqblock is selected.
* Sequencer: Remove the "Delete" popup menu entry
  since it was too similar to "Delete current".
  (It only differered for the behavior of assigned
  keybindings.)
* Automatically add extension to preset names if
  missing. (Akimaze)
* Faust: Use linear velocity->gain conversion for
  very low velocities so that gain can reach zero.
* Audio: Fix pops/scratches/clicks for quite silent
  sounds in the graph that were volume-boosted up
  later in the DSP graph. (Even the "Demo song" demo
  song suffered from this.)
* Build: Add option to use qwebengine instead of
  qtwebkit. (qwebengine has some shortcomings, but
  it can be convenient to use to avoid having to
  compile up qtwebkit.)
* Editor: Fixed coordinate calculation when dropping
  a file. (Akimaze)
* GUI: Option to use the alt key as a horizontal
  scroll modifier (in sequencer and mixer). (Akimaze)
* Faust: Update Faust 2.54.9 -> 2.70.3. (Yustin)